--1.1建表abase=>createtabletest_jsonb(c_bhchar(32),j_jsonb jsonb);CREATETABLE--插入数据insertintotest_jsonb(c_bh,j_jsonb)values(replace(uuid_generate_v4()::text,'-',''),'{"c_xm":"张三","c_mx":{"c_ssdw":"一大队","c_dwbm":"11"}}');INSERT01--查看数据abase=#select*...
select jsonb_path_query('{ "track": { "segments": [ { "location": [ 47.763, 13.4034 ], "start time": "2018-10-14 10:05:14", "HR": 73 }, { "location": [ 47.706, 13.2635 ], "start time": "2018-10-14 10:39:21", "HR": 135 } ] } }'::jsonb, '$.track.segments'...
PostgreSQL supports JSON data types, making it a powerful tool for handling semi-structured data within a relational database. This functionality allows you to store, query, and manipulate JSON documents in PostgreSQL tables. Using JSON functions and operators, you can extract data from JSON columns...
StringInfoData strinfo;/* we first convert char * to datum representation */jsonb_datum = DirectFunctionCall1(jsonb_in, CStringGetDatum(myjson));/* then, we convert it to Jsonb * */jb = DatumGetJsonbP(jsonb_datum);/* prepare element paths to fetch, from outer to inner */initStri...
json 和jsonb 区别 两者从用户操作的角度来说没有区别,区别主要是存储和读取的系统处理(预处理)和耗时方面有区别。json写入快,读取慢,jsonb写入慢,读取快。 常用的操作符 操作符: -> // 右边传入整数(针对纯数组),获取数组的第n个元素,n从0开始算,返回值为json ...
(id) postgres=# explain analyze select * from test where id between 100 and 200; QUERY PLAN --- Index Scan using idx_test_id on test (cost=0.43..10.49 rows=103 width=15) (actual time=0.006..0.058 rows=101 loops=1) Index Cond: ((id >= 100) AND (id <= 200)) Planning Time:...
That query can use the GiST index from the exclusion constraint we created above. If all the above is wrong, should we use JSON in PostgreSQL at all? Don't get me wrong: JSON support in PostgreSQL is a wonderful thing. It is just that many people don't understand how to use it righ...
git clone https://github.com/gtod/postgres-json.git. Then at your REPL evaluate: (ql:register-local-projects) (ql:quickload:postgres-json) Now: (defpackage:simple(:use:cl:postgres-json)) (in-package:simple);; Change to suit your Postgres DB(setf*postmodern-connection*'("mydb""gtod""...
The query below lists all columns with JSON data types in PostgreSQL database. Query select col.table_schema, col.table_name, col.ordinal_position as column_id, col.column_name, col.data_type from information_schema.columns col join information_schema.tables tab on tab.table_schema = col....